Hello MJCG
In Zürich, zone 100 does not exist.
Yearly and monthly tickets, as well as all other day tickets (except for the ZVV Day Pass - 24 hours) are valid until 5 AM the day after expiry. If the validity end date reads 16.05.2024, it is in fact valid until 17.05.2024 at 5:00 a.m. That’s the time the new day starts from the operational perspective.
Kind regards,
Roland